Waterfox is optimized for 64-bit systems (and has no x86 build), and claims to be the fastest 64-bit variant of the Firefox browser.

Major plugins such as Adobe Flash, Sun Java, Microsoft Silverlight all have supported 64-Bit binaries available, and will work with Waterfox just as they would with Firefox. Waterfox is built only for Windows 64-bit systems and no other operating system.

Waterfox was compiled with SSE2, the AMD Core Math Library and the following optimisation flags: /O2 /GR- /GS- /GA. It retains support for Firefox add-ons, too.

NOTE: If you experience problems with blurry fonts, then type about:config in the address bar. In the filter at the top type gfx.direct2d.disabled. Change it from false to true.